Diaphragm pump



Dec. 14 1926. 1,610,473

E. c. REYBOLD, JR, ET AL DIAPHRAGM PUMP Filed April 30 1925 25 Sheets-Sheet 1 IN VEN TOR S Dec. 14 1926. 1,610,473

E. C. REYBOLD, JR., ET AL DIAPHRAGM PUMP Filed April 1925 3 Sheets-$heet 2 Q an W r UH INVENTOR fla 04/ g y an a.

&4. ATTORNEYJ' Patented Dec. 14, 1926.

UNITED STATES 1,610,473 PATENT OFFICE.

EDWIN COMPTON BEYIBOLD, .13., OF DENVER, COLORADO, AND HABZRIBON STBEETEB ODE, OF LAWRENCE, KANSAS, ASSIGNORS TO DORR COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF DELAWARE.

DIAPHRAGM PUMP.

Application filed April 30, 1923. Serial No. 635,426.

This invention relates to diaphragm pumps such as are used in pumping clear iquids or those which contain abrasive materials in suspension. In handling such liquids it is advisable to avoid the useof pistons fitting closely in the pump cylinder because a piston under such conditions would be rapidly worn.

Diaphragm pumps have long been known and used for the purpose described, but such pumps are efi'ective only to create suction. They can be used as pressure pumps if the pressure does not materially exceed a few pounds per square inch, provided that the diaphragm is new and relatively stiff. A diaphragm arranged for pressure on one side has a tendency to reverse with pressure on the other side and render the pump inoperative.

It is the obiect of the present invention to provide a diaphragm pump which is effective both for pressure and suction and which is simple in construction and therefore readily maintainable in operative condition.

Further, objects and advantages of the invention will be apparent as it is better understood by reference to the following specifications and accompanying drawing, in which- Fig. 1 is an end elevation of a pump embodying the invention;

Fig. 2 is a side elevation ofthe pump;

Fig. 3 is anenlarged sectional view of the pump mechanism; and

Fig. 4 is a sectional view of a different form of the pump.

In carryingout the invention we employ two diaphragms in place of the singlediaphragm heretofore used and arrange these diaphragms in opposed relation so that the concave side of each is eifective in the direction of the pressure which it is expected to overcome. Thus thesuction diaphragm preferably has its convex side toward the pump chamber and its concave side toward the direction of the air pressure against which it acts during the suction stroke of the pump. The pressure diaphragm has its concave side toward the pump chamber so that it may exert pressure on the liquid which has been drawn into the pump chamber by .the action of the suction diaphragm. The space between the diaphragms is filled slightly with liquid which, being substantially incompressible, readily transmits pressure from one diaphragm to the other. The arrangement of the diaphragms may bev reversed; that is to say, the convex sides of the diaphragms may face each other. It has been found that the mean volume of the space between the diaphra ms remains substantially constant during tie operation so-that there is no material loss in efiiciency because of lost motion between the diaphragms. The space may be filled with water or other substantially incompressible liquid, and automatic means may be provided to ensure that additional liquid enters as rapidly as any leakage occurs, or the pump may be so arranged that the liquid or material which is moved thereby passes itself between the diaphragms and thus ensures the proper operation of the pump.

It will be understood that the diaphragms are supported at their periphery in such a manner as to ensure a tight joint and are connected at their centers to a suitable piston rod or plunger which may be actuated to flex the diaphragms. The diaphragms, which are preferably made of textile material impregnated with rubber, although leather or rawhide may be used, are moved to and fro as the plunger operates, the free portions of the diaphragms moving with a rolling motion. Durin this movement the diaphragms retain their concave form except near the ends of the stroke in either direction when both of the diaphragms will assume a substantially conical form. Upon the return stroke both diaphragms will with a rolling motion gradually change form until they are a ain in substantially conical form. Therea ter the movement is reversed and repeated. Following this mode of operation the diaphragm, which forms the wall of the pump chamber, will create suction in the chamber as the plunger moves upwardly. for example, and upon the downward stroke the other diaphragm will transmit pressure to the liquid 1n the pump chamher through the liquid which fills the space between the diaphragms and thence through the suction diaphragm.

Referring to the drawing, 5 indlcates a frame which in the present instance consists 015 two A-shaped members, although any suitable frame may be employed. The frame supports bearings 6 for a shaft 7 having a pulley 8 at its end through which power ma be transmitted to the shaft from any suitaile source thereof. An eccentric 9 is mounted on the shaft 7 and is surrounded by a collar 10 to which a plunger rod 11 is connected. The plunger rod 11 extends into a pump bowl or chamber 12 formed by the pump casing 13.

The casing has an inlet 14 which is controlled bv a valve 15, the latter being of any usual or suitable form and having, for example, an extension 16 which holds it in ro er relation to the inlet when the valve is llfted during the o eration of the pump. Preferably a renewab e seat 17 is provided around the edge of the inlet. An air inlet controlled by a cock 16' permits regulation of the suction.

A suction chamber 18 is provided and extends into an outlet 19 which is controlled by a valve 20 similar to the valve 15. The two valves are arranged so'that when suction is created within the suction chamber, the valve 15 will be opened while the valve 20 is closed, and when pressure is exerted the valve 15 will be closed and the valve 20 open. The outlet 19 o ens into an air chamber 21 in which the liquid escapes through a connection 22.

The pump casing is provided with a flange 23 to suppplrt the diaphragms 24 and 25, the latter .ing held in the spaced relation by a ring 26. A locking ring 27 rests upon the upper diaphragm and is held in position to firmly lock the edges of the dia phragms by screws 28 in a pressure ring 29.

The latter is provided with notches in its periphery which permitit to pass over lugs 30 on the inner surface of the pump bowl. The ring may be rotated slightly after it has been inserted in. the pump bowl and thereafter bears against the lower edges of the lugs 30 when the screws 28 force the diaphragm r1ngs together. The inner edges of the diaphragms are held between plates 31. 32 and 33 which are locked together by bolts 34 passing therethrough. The plunger rod 11 extends through the plates and is fastened by a nut 35 which may be heldrin position by a cotter pin 36. As shown in the drawing, the plunger is at the middle point of its travel, both diaphragms being flexed. By the travel of the plunger rod in either direction the rolling motion referred to will be imparted to the diaphragms to create either suction or pressure, depending upon the direction of travel.

To ensure a supply of liquid to the space between the diaphragms, a pipe 37 is con nected to a passage 38 extending through the plates 33 and 32 and opening into the space. At its upper end the i i e is rovided with a check valve 39 whi dh is usually submerged in a supply of water which is maintained within the pump bowl or other reservoir on supply. \Vater is thus automatically supplied to the space whenever leakage occurs. A pipe 40 is connected to a passage 41 in the plate 33 and the passage opens into the space between the diaphragms near the upper diaphragm. The pipe 40 is closed by a cock 42 which may be opened when the pump is first placed in operation to permit the escape of air from the space between the diaphragms. After a few strokes the space will be filled with water which will escape from the pipe 40, and the cock should then be closed.

As hereinbefore stated, downward movement of the plunger rod flexes the diaphragms 24 and 25 and the pressure exerted y the diaphragm 25 forces any liquid which may be within the suction chamber through the valve 20 and thence from the pump. Upon the reversal of the movement, suction is created by the diaphragm 24 and liquid -is drawn into the suction chamber through the valve 15. The pump may thus be used as a ressure and suction pump to deliver liqui s to levels above that of the ump or to create pressures upon the liquid materially exceeding those which,are possible with the single diaphragm pump heretofore in use.

Referring to Fig. 4 a slightly different form of pump is illustrated in which the liquid passes from the suction chamber into the space between the diaphragms and thence from the pump. This form of construction avoids the necessity of providing liquid to fill the space between the diaphragms and permits a simplification of the pump structure, although it has the disadvantage that the weight of the parts which hold the diaphragms in place maybe greater than in the preceding form of the invention. In this pump the casing is provided with a suction chamber 45 having an inlet 46 at its bottom which is closed by a check valve 47. An air inlet 47 controlled by a cock 48 permits regulation of the suction. The die.- phragms 48 and 49 are supported above the suction chamber with-a spacing ring 50 disposed therebetween. The diaphragms are held by a clamping ring 51 and bolts 52. The inner edges of the diaphragms are held by rings 53 and bolts 54, being maintained thereby in spaced relation. A check valve 55' is disposed in the centre of the diaphragm 48 and is adapted to permit the liquid or material being pumped to enter the space between the diaphragms upon the downward stroke. The center of the upper diaphragm is closed by a plate 56 which is removable to permit access to the valves 47 and 55. The latter valve is somewhat larger than the former so that the lower valve may be re moved through the upper valve opening. n0

- plication permits a From the space between the dia hragms the liquid escapes through an out et 57 to an air chamber 58 and passes thence through a connection 59. In order to permit the removal of'the diaphragms it is necessary to provide a joint 60 between the outlet 57 and the air chamber 58. This joint may be se cured by bolts 61 or by other suitable means.

Exce t for the pas'sa e of the liquid between t 10 diaphragms, t 1e pump, illustrated in Fi 4 does not difler from the previously descrlbed embodiment of the invention. The diaphragms are arranged in the sam'c way an are flexed with a rolling motion. The concave sides of the diaphragmsare on the side toward which pressure is exerted during the operation of the pump. Thus, in Fig. 4 the concaveside of the diaphragm 48 is upwardly directeda ainst the direction .of air pressure which is overcome in producing suction, and the concave side of the diaphragm 49 faces downwardly in the direction in which pressure is exerted'upon the liquid inthepump to force it thereom. The pump herein described is suitablefor any pu se wherein liquids containing solid materia sin sus ension must be'handled. It is not limited, owever, tosuch use since it may be em loyed in pumping clear liquids, i and by maIrin g the pump of suitable material it may be used to handle acids, alkalies and other liquids, pulps or sludges either tree from or containlng corrosive or abrasi've in dients. The pum is also useful 1n han ling materials whic1 may be near enough to boiling to burst into steam or vapor, and thus prevent successful operation if pum ing by suction or vacuum is fattempte The pump described in this aplication of pressure and may be set so low t at practically no suction is' required. It is, in fact, peculiarly adapted for such purposes because it may be made substantially tight and requires no lubrication in the amp chamber. Contamination of the liqui s. handled is thus avoided and leakage is prevented..

' Various changes may be made in thed tails of the form and arrangement of the parts without departing from the invention or sacrificing any of the advantages thereof.

We claim: Y

1. In a pump havin a valve-controlled inlet and outlet, flexib e diaphragms spaced apart with their concave faces toward each othergmeans for actuatingthc diaphragms, and means for automatically filling the space between the diaphragms with a liquid.

2. In a pump having a valve-controlled inlet and outlet, flexible disiphragnis arranged with their concave faces in opposed relation, means for holding ithe diaphragms in spaced relation, means for clamping the diaphragms, includlng a rotatable clampwhich the ring is held when it has been rotated, and means for actuating the diaphragms. r p

3; a pump having a valve-controlled inlet and outlet, flexible diaphragms arranged with their concave faees in opposed relation, means for holding the diaphragms in spaced relation, means for actuating the diaphragms, and means for filling the space between the diaphragms with liquid.

ing ring having notches in its peri hcry and logs corresponding with the note we under 4. In a pump having a valve-controlled in- V let and outlet, flexible diaphragms arranged with their concave faces in opposed relation, means for holding the diaphragms in spaced relation, means for actuating the diaphragms, means for filling the space between the diaphragms with liquid, and

means permitting the escnpe'of air from the space between the din hragms.

5. In a pump, a be y providing a suction chamber having a valve-controlled inlet and outlet, a air of flexible diaphragms spaced apart-and arranged with their concave faces in op osed relation at one side of the suction cham r, liquid means for holding the diaphragms in spaced relation and means for actuating the diaphragms.

6. In a pump, abody providing a suction chamber having a valve-controlled inlet and outlet, a air of flexible diaphragms spaced apart and arranged with their concave faces in op osed relation at one side of the suction cham er, means :for actuating the diaphragms, and a valve-controlled passage to -the space between the diaphragms to permit lets and outlets, a pair of annular diaphragms spaced apart, and supported at their outer edges and a rod secured to the inner edges of the'diaphragms-and adapted to reciprocate the diaphragms in both directions.

9-. In a pump, a casing, a chamber within the casing having a valve-controlled inlet and outlet and pump mechanism mounted in the wall of the casing and adapted to alternately create suction and pressure within the chamber, this mechanism consisting of a pair of flexible diaphragins disposed in spaced relation and rigidly sup orted at their outer edges, means connected centrally to thediaphragms for reci rocatin them in phmgm overcomes the pressure in the upboth directions, these diap lragms eing arposite direction due tothe creation of Sucranged to present concave faces outwardly tion within the chamber. 10 and having a liquid medium between them In testimony whereof we aflix our signa- 5 to prevent collapse thereof whereby one diatures.

phragm overcomes the pressure created EDWIN COMPTON REYBOLIIJR. within the chamber and the other dia- HARRISON STREETER COE.

to the diaphrngms for reci rocatin them in phragm overcomes the pressure in the upboth directions, these diap lregms eing arposite direction clue to the creation of Sueranged to present concave faces outwardly tion within the chamber. 10 and having a liquid medium between them In testimony whereof we aflix our signa- 5 to prevent collapse thereof whereby one diatures.

phragm overcomes the pressure created EDWIN COMPTON REYBOLD', JR. within the chamber and the other dia- HARRISON STREETER COE.

eenrimcm: or CORRECTION.

. Patent No. 1,610,473. Granted December H, 1926, to

. eowm COMPTON marrow, anger.

It iehereby certified that the name of tiie'aseignee in the above numbered patentwas erroneously written and primed as "Dorr Company"; whereas eaid name should have been written and prihted as "The Uorr Company", as shown by the records of assignments in this offjee; and that the said Letters Patent ehould be read with this correction therein that the same may conform to the record of the ease in the Patent Office.

Signed and sealed this 27th day of December, A. D. 1927.

, M. J. Moore, Seal. @tingcommiesioaer of Patente.

CERTIFICATE OF CORRECTION.

Patent No. 1,610,473. Granted December F4, 1926, to

EDWIN COMPTON REYBOLD, 11L, E l" AL.

it is hereby certified that the name oi tliea ssignee in the above numbered patent was erroneously written and printed as "Dorr Company", whereas said name should have been written and printed as "The Uorr Company", as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 27th day of December, A. D. 1927.

M. J. Moore,

Seal. Acting Commissioner of Patents. 

